Most of the listings are feed into Trulia from the MLS. The MLS is a web portal used by brokers to input their listings. If a $700 rental did not warrant hiring a broker by the landlord, paying a commission and listing the property with a listing fee then you probably wont see too many of them on Trulia. And doing the search you mentioned above not just in 60640 but all of Chicago is going to get you a lot of parking spaces for rent (just in case you were wondering why there is an address and no photos plus 0bed, 0bath and 0sqft.). I have found under $700 is typically on craigslist and usually for rent by owner. So don't get discouraged, you will find something there.
I hope that helps -